Questions tagged [high-current]

Say how much current is required, high-current means different things to different people.

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38 views

Thermal cutoff for a high current mains application

I'm designing an inrush current limiter for a large rack which will under normal conditions draw ~25 A at 230 VAC. I'd like to be able to trip the current carrying live wire if the temperature in my ...
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1answer
47 views

What value of inductance and type of inductor should i choose for my motor driver circuit? [closed]

I am current design a DC motor driver circuit for 24 volts and 50 amperes since the motors I am using take 25 amperes nominally. I will be using PWM signal to control the output. I was suggested to ...
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1answer
66 views

Low voltage / high current rectifier using MOSFET

I was wondering if the following approach to make a very low voltage / high current rectifier (~0.1 V, 1 kA DC) from 230 V AC has any sense or not. Aiming at simplicity rather than effectiveness, I ...
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2answers
101 views

Two-Channel PWM LED Driving at 12A Load Issue (Signals affect each other)

I am designing a two-channel PWM LED driver. It will switch 24V LED strips at 12 amps. Each strip has two white LED chips. Each channel complements the duty-cycle of the other one (i.e. while one ...
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1answer
60 views

High current, slow turn-on, low ripple power supply

I am a hobbyist and I'm trying to make a power supply that withstands a few amps load, that also has a slow turn-on and low ripple. I'm powering up an ESP32-Cam that's pretty sensitive to ripple and ...
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1answer
42 views

RS-550 DC motor controller 24V (35-70) A working range and a stall of 120A

I am currently designing a motor controller for a SUMO robotics challenge. Each of a two motor setup exhibits a (0.15-0.40) N.m torque resulting them pulling (35-70) Amps nominally and a peak of 120 ...
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1answer
54 views

Smoothing out current spikes so three-phase machine doesn't exceed site's electrical supply

We are looking at installing a machine at one of our manufacturing sites that draws around 120A at 415V three-phase (we are in the UK) but the maximum current we can draw at our site is 100A before ...
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0answers
33 views

ULN2803 relay driver working for high loads

I am trying to understand the working of this Darlington transistor array. I am using it for inductive loads and for driving the loads of my relays, but now I am trying to understand the part of its ...
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1answer
80 views

If I use a 19V 4.7A supply to a MAX 250W ATX power supply am I an idiot or should it be safe enough?

I can do the maths, I get near 90W, but I'm only planning to draw under a quarter of the power supplies (ebay link) rated max of 5V/12V combo (estimated load 30W). I therefore consider my 19V old ...
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3answers
92 views

What is a “safe” amount of amps to draw from this pack

I've been working on a quadruped project, and need some help determining the... safety... of my power system. To start, there's two packs, a larger "main" and a smaller "reserve" the two packs are ...
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3answers
92 views

Is Inductor peak current same as the Inductor Inrush current

I am using a DC-DC converter which is having an inductor rating of 68uH and 2.05A. Output Voltage of dc-dc is 23V and output current max is 300mA Schematic : I am using a current probe and ...
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1answer
70 views

12v 25A power distribution PCB design

The goal is to control 18 devices by using rocker switches with LED. The total ampere can be up to 25A. The PCB size is 150mm x 250mm. The configuration is FR-4 with 2 oz/ft^2 copper. The bottom ...
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1answer
87 views

Creating High current DC Power supply [closed]

I have the following resources: Input - 24 V 80 Ah DC Battery (Car Battery) Output, what i want: 12V DC with <2 Amp for driving some of the sensors. 5V DC with <2 Amp for driving micro ...
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1answer
88 views

1000uF capacitor to protect 5v 30amp circuit

I wish to build a LED cube but have no experience in shift registers so I am building one with addressable LEDs that can draw 60mA each. I want to make an 8x8x8 cube so that would be 512 LEDs and 30....
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0answers
15 views

lightning current with isolated cable

I am trying to understand what happend when designing a lightning protection system using isolated cable (with specified separation distance, lets say in this case with 0.5m). Following IEC 62305 I ...
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2answers
62 views

How to have a load pull more current from a low voltage high current battery

I am designing a pair of heated pants and have run into an issue with having to use batteries (or any other portable power source) to power them. What I have now is about 50ft of Teflon wire with 5Ω ...
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0answers
39 views

N-MOSFET not passing current when gate is high (SPICE)

I'm having a very strange issue with some power MOSFET circuits I'm trying to build for regulated high-current pulses. I can get my circuit to work fine when I use a lower-amperage power MOSFET, but ...
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0answers
61 views

Thyristors problem in a 1800v capacitor discharge system

I have two thyristors “R1275nc21x, they are Westcode thyristor and have some issues in my application. I want to make a capacitor draining system with 1800V charged and it can discharge to the coil (...
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5answers
149 views

High Power Variable Potential Divider

I have a DC high voltage (>270V) high current (>40A) circuit which needs to power a standard LED along the way to a heater. The LED is to indicate whether or not the heater is activated. I'm ...
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0answers
56 views

How should I modify a welder to add a pedal to enable the output?

I'm restoring/improving an old welder rated 3.2 kW input, 115 A DC output, 52 V no load. I'm adding a ready made soft-start circuit based on a NTC plus bypass relay rated 100 A and capacitors to ...
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1answer
75 views

High current over 5V on PCB panes instead of track

I have leds running for around 600 Watts of 5V leds (120 amps). The source of the power are three 48V to 5V converters which each can handle 200 watts. If I would run this amount of Amps over my PCB ...
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1answer
138 views

10 Amp Current Limit

I have a 28VDC, high current supply (constant voltage) that is required to charge an emergency power supply. These EPS internals are rated at 15 amps max input current, however, it’s stipulated that ...
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1answer
35 views

Ground separation between ADC and high current capacitor discharge circuit

I recently designed a capacitor discharge welder for my welding applications, and I come through a problem about separating grounds between AGND of the controller and (-) terminal of the big 1.3 ...
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1answer
33 views

Connect multiple source pins together to power signal in Eaglesoft

According to PCB shown below, I have a bunch of MOSFETs with HSOF package with 7 pins of source for each and failed to connect EVERY pin to the connector. In other words, when routing the source ...
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4answers
363 views

Multiple switching LED drivers on single PCB

I am working on a high power LED board project. It requires to have 100 LEDs, of different types and colors. There will need to be 17 individual strands (need to be able to dim them separate.) Max ...
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2answers
172 views

Stacking M.O.T. to create an E-E core

I just came across this site looking for answers on some questions I have concerning microwave oven transformers (M.O.T.). I am currently going into my third year as an E.E. student and I am trying to ...
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2answers
225 views

Can single phase AC produce a continuous electric arc?

Constant DC supply and 3 phase AC (in mercury rectifier) can produce a continuous arc. But can single phase AC also produce a continuous arc? Because it is written on the web that arc extinguishes at ...
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0answers
81 views

Oscilloscope high voltage and current measurements

I have been tasked with measuring both the voltage and current output of a plasma system but have only been provided and oscilloscope to do this (Tektonix TBS 2000 Series 100MHz, 1G/s) and a high ...
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1answer
97 views

Supercapacitor based lightning-harvester [closed]

Could lightning discharges be harvested and stored in supercapacitor banks? Could supercapacitors withstand and collect lightning? Lightning usually lasts for about 10 micro seconds and reaches ...
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0answers
64 views

Standards for colour of conductors of pre-assembled cables

We are designing a product for industrial energy storage systems. Multiple units are connected with pre-fabricated cable assemblies of 2-4 separate leads that are terminated in connectors unique to ...
3
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1answer
88 views

How to design a contactless mechanical shaker [closed]

I am trying to design a circuit to make an inductor oscillate with high-current (around 50A) at a low frequency. The inductor will act as a high-powered electromagnet. Most designs I've worked/messed ...
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2answers
75 views

High current on PCB to through hole connector

If I have a though-hole connector with 3.5mm pin spacing and the manufacture rates it for 14 amps per contact, how am I supposed to safely carry anywhere near that current over the PCB? Specifically, ...
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0answers
48 views

What capacitor to use for high voltage & high current filter application

I am designing a filter that needs a capacitor. I am not allowed to paste the schematic here, so only the maximum voltage at and current through the cap, pasted from the spice simulation: (voltage is ...
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0answers
201 views

Proper capacitors for ESP8266-12F?, resetting at high current peak

When using the ESP8266-12F on a PCB I designed myself it keeps resetting after a high current spike of another module (Sim800L). I ofcourse tried to solve this using capacitors but I seem to have made ...
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3answers
277 views

2000A current sensing using STM32

Is there any chance to read 2000A using STM32? I searched the Internet for low-value shunt resistor but nothing found. maybe some kind of current transformer could do the job!! any help will be ...
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0answers
360 views

Safe Voltage/Amperage for Soldered Wires - aka When to Crimp Instead

I have found a lot of information that circles around what I'm looking for, but nothing that directly answers it. It is possible there is no right answer.     I am jealous of the Macbook ...
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2answers
240 views

Which resistors to use for high current (10A) voltage-divider? [closed]

I'm having a problem determining resistor specs (especially wattage) for my voltage divider circuit [ 27 V to 17.5 \$+-\$ 0.5 V ] on 10 ampere DC supply. I have an AC (220V 50Hz) to DC (27V 10A) ...
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1answer
108 views

How to safely limit current for DC12v 30a?

I am plating my vias with electrolysis, and I need to safely limit the current so it doesn't go over 30 amps. The power supply I'm going to order is, you guessed it, 12V 30A. I've calculated the ...
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2answers
113 views

Multiplexing high current connections?

Noob question here. Currently I'm using a darlington transistor array to drive about 14 IR leds. I want to be use a CD74HC4067 multiplexer to simplify and shrink things up a bit. The IR led's I'm ...
2
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0answers
43 views

Suggestions solutions for high current bed of nails style testing [closed]

I'm trying to create a tester board that will hold some power path components (DC input caps, IGBTs, current sensors) that are normally on the Unit Under Test (UUT). I'd like to connect these ...
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2answers
99 views

Sizing cables in pulsed power applications

I am looking for rules for sizing cables for short pulses. For example, if I were to run 2000A DC current for 0.5 seconds in a cable, what size would I need? Sizing as if it were continuous current ...
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1answer
90 views

High voltage and current

I have a DC motor that needs and works nearly 400v and 20A. I chose FDL100N50 for n-channel mosfet also IXTK40P50P for p-channel mosfet. I connect a 4n35 optocupler for output of every mosfet. Are ...
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2answers
112 views

Joining high current wires outdoors

I am conducting an experiment where I would like to heat up 18 AWG copper cables outdoors using to 50-60°C using 60 amps. The wires are wrapped with teflon to prevent damage to the cable. Can I use a ...
7
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1answer
1k views

Series pass transistor, LM7812

I am making a 12 volt regulator for a solar panel to power an audio amplifier. I already have a switching regulator for most application but it is very noisy for amplifier even with a lot of filtering....
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0answers
45 views

Shorting the output of both the channels of L298N

Suppose I started with a project requiring the control of motors and ended with using L298N in my project, realizing that my motor only takes around 1.5A when on load. Now, with time I realized that ...
2
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1answer
321 views

High current, low voltage capacitors

I'm putting together a high current (200A+), low voltage (<5v) rectifier circuit. I have sufficient bridge rectifiers, but to smooth out the waveform I need a strong enough capacitor bank. Besides ...
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1answer
123 views

Stabilize circuit on 5V 2A

I have not yet build following circuit: Circuit in high performance needs 5V 1.7A (measured). I have source which is powerbank with 16 000 mAh. Outputting via ports: USB-C 5V/3A, USB-A 5V/3A, Micro-...
0
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1answer
229 views

Sizing a trace on a PCB to carry 50 amps

Currently working on a 4 layer pcb-card where I need to trace for 50 amps, any ideas how I can design it? Any tips would be appreciated. Thanks!
1
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0answers
117 views

Electric heating for glass melting furnace

Some furnaces use electricity for glass melting. Low voltage and high amperage power is passed through the molten glass through 2 molybednum electrodes dipped into the glass. The molten glass acts as ...
2
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1answer
177 views

How to generate a high energy electromagnetic wave? Using high voltage or high current?

I am about generating an electromagnetic wave which should be powerful enough. So I should manipulate its electric field and magnetic field simultaneously. As far as I know E amplitude depends on the ...

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